摘要
柔性有机突触晶体管(FOSTs)由于其灵活性、生物相容性、易于加工和低复杂性而引起了广泛关注.然而,FOSTs很难在满足装置变形要求的同时保持其突触性质的机械稳定性.在此,我们通过实验发现,弯曲变形对FOSTs的突触性能(即兴奋性突触后电流(EPSC)值)的影响大于对导通电流的影响.此外,通过公式推导,我们证明了通道附近产生的弯曲诱导缺陷状态的密度显著影响突触性能.我们提出了一种使用封装层调整器件稳定段的通用方法.无调节稳定段的普通FOSTs的EPSC值在弯曲后下降了近1.5-2个数量级.相比之下,设计的柔性突触装置表现出相对稳定的EPSC.此外,设计的FOSTs表现出稳定的成对脉冲促进、长期增强和光学突触性能.此外,使用手写人工神经网络在500次弯曲循环前后基于我们的设备进行神经形态计算模拟,该设备在50个学习周期后显示出稳定的识别精度(初始状态下91.55%,500个弯曲周期后90.43%).稳定段在柔性突触晶体管中的成功应用为制造具有机械稳定性的柔性神经形态电子器件提供了一个方便和简单的思路.
Flexible organic synaptic transistors(FOSTs)have attracted considerable attention owing to their flexibility,biocompatibility,ease of processing,and reduced complexity.However,FOSTs rarely maintain the mechanical stability of their synaptic properties while meeting the device deformation requirements.Here,we experimentally found that bending deformation had a greater influence on the synaptic performance(i.e.,the excitatory postsynaptic current(EPSC)value)of FOSTs than on the on-state current.Moreover,through formula derivation,we proved that the density of bending-induced defect states generated near the channel considerably influences the synaptic performance.We propose a general approach to tune the stable segment of the device using an encapsulation layer.The EPSC value of the ordinary FOSTs without a regulated stable segment decreased by nearly 1.5-2 orders of magnitude after bending.In contrast,the designed flexible synaptic device exhibited relatively stable EPSC.Moreover,the designed FOST exhibited stable pairedpulse facilitation,long-term potentiation,and optical synaptic performance.Furthermore,neuromorphic computational simulations based on our device before and after 500 bending cycles were performed using a handwritten artificial neural network.The device showed stable recognition accuracy after 50 learning cycles(91.55%in the initial state and 90.43%after 500 bending cycles).The successful application of a stable segment in flexible synaptic transistors provides a convenient and simple idea for fabricating flexible neuromorphic electronics with mechanical stability.
作者
庄冰泳
汪秀梅
安传斌
王聪勇
刘璐健
陈惠鹏
郭太良
胡文平
Bingyong Zhuang;Xiumei Wang;Chuanbin An;Congyong Wang;Lujian Liu;Huipeng Chen;Tailiang Guo;Wenping Hu(Institute of Optoelectronic Display,National&Local United Engineering Lab of Flat Panel Display Technology,Fuzhou University,Fuzhou 350002,China;Joint School of National University of Singapore and Tianjin University,International Campus of Tianjin University,Binhai New City,Fuzhou 350207,China;Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China,Fuzhou 350100,China;Tianjin Key Laboratory of Molecular Optoelectronic Sciences,Department of Chemistry,School of Science,Tianjin University&Collaborative Innovation Center of Chemical Science and Engineering(Tianjin),Tianjin 300072,China)
基金
the financial support from the National Natural Science Foundation of China(61974029)
the Natural Science Foundation for Distinguished Young Scholars of Fujian Province(2020J06012)
Fujian Science&Technology Innovation Laboratory for Optoelectronic Information of China(2021ZZ129)。
